At grade is awful, stopping everywhere. That includes in Amsterdam. Benefits of tunnels would be * No need to stop * Protection from elements (I for one woul

At grade is awful, stopping everywhere. That includes in Amsterdam. Benefits of tunnels would be * No need to stop * Protection from elements (I for one would be far happier riding in summer if it wasn't sweltering, or in winter if it wasn't bitterly cold and rain) * Mostly flat tunnels (No hills to climb up and over) * Certainty that the route won't be removed for some reason Of course would never find the money.